Commits

Anonymous committed 682f0a5

Initial templating system (just one page for now).

1. Import Twig library.
2. New PW_Template classes to wrap around Twig and set up defaults.
3. All header/footer HTML moved into base layout (base.html).
4. Colour schemes moved into CSS>
5. CSS for Lords and Scotland given more obvious names ('lords.css' instead of 'red.css') and all CSS kept in one directory.

Still need to sort out displaying account menu and secondary links, as well as staging site banner.

Comments (0)

Files changed (131)

lib/Twig/Autoloader.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Autoloads Twig classes.
+ *
+ * @package twig
+ * @author  Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Autoloader
+{
+    /**
+     * Registers Twig_Autoloader as an SPL autoloader.
+     */
+    static public function register()
+    {
+        ini_set('unserialize_callback_func', 'spl_autoload_call');
+        spl_autoload_register(array(new self, 'autoload'));
+    }
+
+    /**
+     * Handles autoloading of classes.
+     *
+     * @param  string  $class  A class name.
+     *
+     * @return boolean Returns true if the class has been loaded
+     */
+    static public function autoload($class)
+    {
+        if (0 !== strpos($class, 'Twig')) {
+            return;
+        }
+
+        if (file_exists($file = dirname(__FILE__).'/../'.str_replace(array('_', "\0"), array('/', ''), $class).'.php')) {
+            require $file;
+        }
+    }
+}

lib/Twig/Compiler.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Compiles a node to PHP code.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Compiler implements Twig_CompilerInterface
+{
+    protected $lastLine;
+    protected $source;
+    protected $indentation;
+    protected $env;
+
+    /**
+     * Constructor.
+     *
+     * @param Twig_Environment $env The twig environment instance
+     */
+    public function __construct(Twig_Environment $env)
+    {
+        $this->env = $env;
+    }
+
+    /**
+     * Returns the environment instance related to this compiler.
+     *
+     * @return Twig_Environment The environment instance
+     */
+    public function getEnvironment()
+    {
+        return $this->env;
+    }
+
+    /**
+     * Gets the current PHP code after compilation.
+     *
+     * @return string The PHP code
+     */
+    public function getSource()
+    {
+        return $this->source;
+    }
+
+    /**
+     * Compiles a node.
+     *
+     * @param Twig_NodeInterface $node   The node to compile
+     * @param integer            $indent The current indentation
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function compile(Twig_NodeInterface $node, $indentation = 0)
+    {
+        $this->lastLine = null;
+        $this->source = '';
+        $this->indentation = $indentation;
+
+        $node->compile($this);
+
+        return $this;
+    }
+
+    public function subcompile(Twig_NodeInterface $node, $raw = true)
+    {
+        if (false === $raw) {
+            $this->addIndentation();
+        }
+
+        $node->compile($this);
+
+        return $this;
+    }
+
+    /**
+     * Adds a raw string to the compiled code.
+     *
+     * @param  string $string The string
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function raw($string)
+    {
+        $this->source .= $string;
+
+        return $this;
+    }
+
+    /**
+     * Writes a string to the compiled code by adding indentation.
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function write()
+    {
+        $strings = func_get_args();
+        foreach ($strings as $string) {
+            $this->addIndentation();
+            $this->source .= $string;
+        }
+
+        return $this;
+    }
+
+    public function addIndentation()
+    {
+        $this->source .= str_repeat(' ', $this->indentation * 4);
+
+        return $this;
+    }
+
+    /**
+     * Adds a quoted string to the compiled code.
+     *
+     * @param  string $string The string
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function string($value)
+    {
+        $this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
+
+        return $this;
+    }
+
+    /**
+     * Returns a PHP representation of a given value.
+     *
+     * @param  mixed $value The value to convert
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function repr($value)
+    {
+        if (is_int($value) || is_float($value)) {
+            $this->raw($value);
+        } else if (null === $value) {
+            $this->raw('null');
+        } else if (is_bool($value)) {
+            $this->raw($value ? 'true' : 'false');
+        } else if (is_array($value)) {
+            $this->raw('array(');
+            $i = 0;
+            foreach ($value as $key => $value) {
+                if ($i++) {
+                    $this->raw(', ');
+                }
+                $this->repr($key);
+                $this->raw(' => ');
+                $this->repr($value);
+            }
+            $this->raw(')');
+        } else {
+            $this->string($value);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Adds debugging information.
+     *
+     * @param Twig_NodeInterface $node The related twig node
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function addDebugInfo(Twig_NodeInterface $node)
+    {
+        if ($node->getLine() != $this->lastLine) {
+            $this->lastLine = $node->getLine();
+            $this->write("// line {$node->getLine()}\n");
+        }
+
+        return $this;
+    }
+
+    /**
+     * Indents the generated code.
+     *
+     * @param integer $indent The number of indentation to add
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function indent($step = 1)
+    {
+        $this->indentation += $step;
+
+        return $this;
+    }
+
+    /**
+     * Outdents the generated code.
+     *
+     * @param integer $indent The number of indentation to remove
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function outdent($step = 1)
+    {
+        $this->indentation -= $step;
+
+        if ($this->indentation < 0) {
+            throw new Twig_Error('Unable to call outdent() as the indentation would become negative');
+        }
+
+        return $this;
+    }
+}

lib/Twig/CompilerInterface.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by compiler classes.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_CompilerInterface
+{
+    /**
+     * Compiles a node.
+     *
+     * @param  Twig_NodeInterface $node The node to compile
+     *
+     * @return Twig_CompilerInterface The current compiler instance
+     */
+    function compile(Twig_NodeInterface $node);
+
+    /**
+     * Gets the current PHP code after compilation.
+     *
+     * @return string The PHP code
+     */
+    function getSource();
+}

lib/Twig/Environment.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Stores the Twig configuration.
+ *
+ * @package twig
+ * @author  Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Environment
+{
+    const VERSION = '1.1.0-RC2';
+
+    protected $charset;
+    protected $loader;
+    protected $debug;
+    protected $autoReload;
+    protected $cache;
+    protected $lexer;
+    protected $parser;
+    protected $compiler;
+    protected $baseTemplateClass;
+    protected $extensions;
+    protected $parsers;
+    protected $visitors;
+    protected $filters;
+    protected $tests;
+    protected $functions;
+    protected $globals;
+    protected $runtimeInitialized;
+    protected $loadedTemplates;
+    protected $strictVariables;
+    protected $unaryOperators;
+    protected $binaryOperators;
+    protected $templateClassPrefix = '__TwigTemplate_';
+    protected $functionCallbacks;
+    protected $filterCallbacks;
+
+    /**
+     * Constructor.
+     *
+     * Available options:
+     *
+     *  * debug: When set to `true`, the generated templates have a __toString()
+     *           method that you can use to display the generated nodes (default to
+     *           false).
+     *
+     *  * charset: The charset used by the templates (default to utf-8).
+     *
+     *  * base_template_class: The base template class to use for generated
+     *                         templates (default to Twig_Template).
+     *
+     *  * cache: An absolute path where to store the compiled templates, or
+     *           false to disable compilation cache (default)
+     *
+     *  * auto_reload: Whether to reload the template is the original source changed.
+     *                 If you don't provide the auto_reload option, it will be
+     *                 determined automatically base on the debug value.
+     *
+     *  * strict_variables: Whether to ignore invalid variables in templates
+     *                      (default to false).
+     *
+     *  * autoescape: Whether to enable auto-escaping (default to true);
+     *
+     *  * optimizations: A flag that indicates which optimizations to apply
+     *                   (default to -1 which means that all optimizations are enabled;
+     *                   set it to 0 to disable)
+     *
+     * @param Twig_LoaderInterface   $loader  A Twig_LoaderInterface instance
+     * @param array                  $options An array of options
+     */
+    public function __construct(Twig_LoaderInterface $loader = null, $options = array())
+    {
+        if (null !== $loader) {
+            $this->setLoader($loader);
+        }
+
+        $options = array_merge(array(
+            'debug'               => false,
+            'charset'             => 'UTF-8',
+            'base_template_class' => 'Twig_Template',
+            'strict_variables'    => false,
+            'autoescape'          => true,
+            'cache'               => false,
+            'auto_reload'         => null,
+            'optimizations'       => -1,
+        ), $options);
+
+        $this->debug              = (bool) $options['debug'];
+        $this->charset            = $options['charset'];
+        $this->baseTemplateClass  = $options['base_template_class'];
+        $this->autoReload         = null === $options['auto_reload'] ? $this->debug : (bool) $options['auto_reload'];
+        $this->extensions         = array(
+            'core'      => new Twig_Extension_Core(),
+            'escaper'   => new Twig_Extension_Escaper((bool) $options['autoescape']),
+            'optimizer' => new Twig_Extension_Optimizer($options['optimizations']),
+        );
+        $this->strictVariables    = (bool) $options['strict_variables'];
+        $this->runtimeInitialized = false;
+        $this->setCache($options['cache']);
+        $this->functionCallbacks = array();
+        $this->filterCallbacks = array();
+    }
+
+    /**
+     * Gets the base template class for compiled templates.
+     *
+     * @return string The base template class name
+     */
+    public function getBaseTemplateClass()
+    {
+        return $this->baseTemplateClass;
+    }
+
+    /**
+     * Sets the base template class for compiled templates.
+     *
+     * @param string $class The base template class name
+     */
+    public function setBaseTemplateClass($class)
+    {
+        $this->baseTemplateClass = $class;
+    }
+
+    /**
+     * Enables debugging mode.
+     */
+    public function enableDebug()
+    {
+        $this->debug = true;
+    }
+
+    /**
+     * Disables debugging mode.
+     */
+    public function disableDebug()
+    {
+        $this->debug = false;
+    }
+
+    /**
+     * Checks if debug mode is enabled.
+     *
+     * @return Boolean true if debug mode is enabled, false otherwise
+     */
+    public function isDebug()
+    {
+        return $this->debug;
+    }
+
+    /**
+     * Enables the auto_reload option.
+     */
+    public function enableAutoReload()
+    {
+        $this->autoReload = true;
+    }
+
+    /**
+     * Disables the auto_reload option.
+     */
+    public function disableAutoReload()
+    {
+        $this->autoReload = false;
+    }
+
+    /**
+     * Checks if the auto_reload option is enabled.
+     *
+     * @return Boolean true if auto_reload is enabled, false otherwise
+     */
+    public function isAutoReload()
+    {
+        return $this->autoReload;
+    }
+
+    /**
+     * Enables the strict_variables option.
+     */
+    public function enableStrictVariables()
+    {
+        $this->strictVariables = true;
+    }
+
+    /**
+     * Disables the strict_variables option.
+     */
+    public function disableStrictVariables()
+    {
+        $this->strictVariables = false;
+    }
+
+    /**
+     * Checks if the strict_variables option is enabled.
+     *
+     * @return Boolean true if strict_variables is enabled, false otherwise
+     */
+    public function isStrictVariables()
+    {
+        return $this->strictVariables;
+    }
+
+    /**
+     * Gets the cache directory or false if cache is disabled.
+     *
+     * @return string|false
+     */
+    public function getCache()
+    {
+        return $this->cache;
+    }
+
+     /**
+      * Sets the cache directory or false if cache is disabled.
+      *
+      * @param string|false $cache The absolute path to the compiled templates,
+      *                            or false to disable cache
+      */
+    public function setCache($cache)
+    {
+        $this->cache = $cache ? $cache : false;
+    }
+
+    /**
+     * Gets the cache filename for a given template.
+     *
+     * @param string $name The template name
+     *
+     * @return string The cache file name
+     */
+    public function getCacheFilename($name)
+    {
+        if (false === $this->cache) {
+            return false;
+        }
+
+        $class = substr($this->getTemplateClass($name), strlen($this->templateClassPrefix));
+
+        return $this->getCache().'/'.substr($class, 0, 2).'/'.substr($class, 2, 2).'/'.substr($class, 4).'.php';
+    }
+
+    /**
+     * Gets the template class associated with the given string.
+     *
+     * @param string $name The name for which to calculate the template class name
+     *
+     * @return string The template class name
+     */
+    public function getTemplateClass($name)
+    {
+        return $this->templateClassPrefix.md5($this->loader->getCacheKey($name));
+    }
+
+    /**
+     * Gets the template class prefix.
+     *
+     * @return string The template class prefix
+     */
+    public function getTemplateClassPrefix()
+    {
+        return $this->templateClassPrefix;
+    }
+
+    /**
+     * Renders a template.
+     *
+     * @param string $name    The template name
+     * @param array  $context An array of parameters to pass to the template
+     *
+     * @return string The rendered template
+     */
+    public function render($name, array $context = array())
+    {
+        return $this->loadTemplate($name)->render($context);
+    }
+
+    /**
+     * Loads a template by name.
+     *
+     * @param  string  $name  The template name
+     *
+     * @return Twig_TemplateInterface A template instance representing the given template name
+     */
+    public function loadTemplate($name)
+    {
+        $cls = $this->getTemplateClass($name);
+
+        if (isset($this->loadedTemplates[$cls])) {
+            return $this->loadedTemplates[$cls];
+        }
+
+        if (!class_exists($cls, false)) {
+            if (false === $cache = $this->getCacheFilename($name)) {
+                eval('?>'.$this->compileSource($this->loader->getSource($name), $name));
+            } else {
+                if (!file_exists($cache) || ($this->isAutoReload() && !$this->loader->isFresh($name, filemtime($cache)))) {
+                    $this->writeCacheFile($cache, $this->compileSource($this->loader->getSource($name), $name));
+                }
+
+                require_once $cache;
+            }
+        }
+
+        if (!$this->runtimeInitialized) {
+            $this->initRuntime();
+        }
+
+        return $this->loadedTemplates[$cls] = new $cls($this);
+    }
+
+    /**
+     * Clears the internal template cache.
+     */
+    public function clearTemplateCache()
+    {
+        $this->loadedTemplates = array();
+    }
+
+    /**
+     * Clears the template cache files on the filesystem.
+     */
+    public function clearCacheFiles()
+    {
+        if (false === $this->cache) {
+            return;
+        }
+
+        foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($this->cache), RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
+            if ($file->isFile()) {
+                @unlink($file->getPathname());
+            }
+        }
+    }
+
+    /**
+     * Gets the Lexer instance.
+     *
+     * @return Twig_LexerInterface A Twig_LexerInterface instance
+     */
+    public function getLexer()
+    {
+        if (null === $this->lexer) {
+            $this->lexer = new Twig_Lexer($this);
+        }
+
+        return $this->lexer;
+    }
+
+    /**
+     * Sets the Lexer instance.
+     *
+     * @param Twig_LexerInterface A Twig_LexerInterface instance
+     */
+    public function setLexer(Twig_LexerInterface $lexer)
+    {
+        $this->lexer = $lexer;
+    }
+
+    /**
+     * Tokenizes a source code.
+     *
+     * @param string $source The template source code
+     * @param string $name   The template name
+     *
+     * @return Twig_TokenStream A Twig_TokenStream instance
+     */
+    public function tokenize($source, $name = null)
+    {
+        return $this->getLexer()->tokenize($source, $name);
+    }
+
+    /**
+     * Gets the Parser instance.
+     *
+     * @return Twig_ParserInterface A Twig_ParserInterface instance
+     */
+    public function getParser()
+    {
+        if (null === $this->parser) {
+            $this->parser = new Twig_Parser($this);
+        }
+
+        return $this->parser;
+    }
+
+    /**
+     * Sets the Parser instance.
+     *
+     * @param Twig_ParserInterface A Twig_ParserInterface instance
+     */
+    public function setParser(Twig_ParserInterface $parser)
+    {
+        $this->parser = $parser;
+    }
+
+    /**
+     * Parses a token stream.
+     *
+     * @param Twig_TokenStream $tokens A Twig_TokenStream instance
+     *
+     * @return Twig_Node_Module A Node tree
+     */
+    public function parse(Twig_TokenStream $tokens)
+    {
+        return $this->getParser()->parse($tokens);
+    }
+
+    /**
+     * Gets the Compiler instance.
+     *
+     * @return Twig_CompilerInterface A Twig_CompilerInterface instance
+     */
+    public function getCompiler()
+    {
+        if (null === $this->compiler) {
+            $this->compiler = new Twig_Compiler($this);
+        }
+
+        return $this->compiler;
+    }
+
+    /**
+     * Sets the Compiler instance.
+     *
+     * @param Twig_CompilerInterface $compiler A Twig_CompilerInterface instance
+     */
+    public function setCompiler(Twig_CompilerInterface $compiler)
+    {
+        $this->compiler = $compiler;
+    }
+
+    /**
+     * Compiles a Node.
+     *
+     * @param Twig_NodeInterface $node A Twig_NodeInterface instance
+     *
+     * @return string The compiled PHP source code
+     */
+    public function compile(Twig_NodeInterface $node)
+    {
+        return $this->getCompiler()->compile($node)->getSource();
+    }
+
+    /**
+     * Compiles a template source code.
+     *
+     * @param string $source The template source code
+     * @param string $name   The template name
+     *
+     * @return string The compiled PHP source code
+     */
+    public function compileSource($source, $name = null)
+    {
+        try {
+            return $this->compile($this->parse($this->tokenize($source, $name)));
+        } catch (Twig_Error $e) {
+            $e->setTemplateFile($name);
+            throw $e;
+        } catch (Exception $e) {
+            throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $name, $e);
+        }
+    }
+
+    /**
+     * Sets the Loader instance.
+     *
+     * @param Twig_LoaderInterface $loader A Twig_LoaderInterface instance
+     */
+    public function setLoader(Twig_LoaderInterface $loader)
+    {
+        $this->loader = $loader;
+    }
+
+    /**
+     * Gets the Loader instance.
+     *
+     * @return Twig_LoaderInterface A Twig_LoaderInterface instance
+     */
+    public function getLoader()
+    {
+        return $this->loader;
+    }
+
+    /**
+     * Sets the default template charset.
+     *
+     * @param string $charset The default charset
+     */
+    public function setCharset($charset)
+    {
+        $this->charset = $charset;
+    }
+
+    /**
+     * Gets the default template charset.
+     *
+     * @return string The default charset
+     */
+    public function getCharset()
+    {
+        return $this->charset;
+    }
+
+    /**
+     * Initializes the runtime environment.
+     */
+    public function initRuntime()
+    {
+        $this->runtimeInitialized = true;
+
+        foreach ($this->getExtensions() as $extension) {
+            $extension->initRuntime($this);
+        }
+    }
+
+    /**
+     * Returns true if the given extension is registered.
+     *
+     * @param string $name The extension name
+     *
+     * @return Boolean Whether the extension is registered or not
+     */
+    public function hasExtension($name)
+    {
+        return isset($this->extensions[$name]);
+    }
+
+    /**
+     * Gets an extension by name.
+     *
+     * @param string $name The extension name
+     *
+     * @return Twig_ExtensionInterface A Twig_ExtensionInterface instance
+     */
+    public function getExtension($name)
+    {
+        if (!isset($this->extensions[$name])) {
+            throw new Twig_Error_Runtime(sprintf('The "%s" extension is not enabled.', $name));
+        }
+
+        return $this->extensions[$name];
+    }
+
+    /**
+     * Registers an extension.
+     *
+     * @param Twig_ExtensionInterface $extension A Twig_ExtensionInterface instance
+     */
+    public function addExtension(Twig_ExtensionInterface $extension)
+    {
+        $this->extensions[$extension->getName()] = $extension;
+    }
+
+    /**
+     * Removes an extension by name.
+     *
+     * @param string $name The extension name
+     */
+    public function removeExtension($name)
+    {
+        unset($this->extensions[$name]);
+    }
+
+    /**
+     * Registers an array of extensions.
+     *
+     * @param array $extensions An array of extensions
+     */
+    public function setExtensions(array $extensions)
+    {
+        foreach ($extensions as $extension) {
+            $this->addExtension($extension);
+        }
+    }
+
+    /**
+     * Returns all registered extensions.
+     *
+     * @return array An array of extensions
+     */
+    public function getExtensions()
+    {
+        return $this->extensions;
+    }
+
+    /**
+     * Registers a Token Parser.
+     *
+     * @param Twig_TokenParserInterface $parser A Twig_TokenParserInterface instance
+     */
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        if (null === $this->parsers) {
+            $this->getTokenParsers();
+        }
+
+        $this->parsers->addTokenParser($parser);
+    }
+
+    /**
+     * Gets the registered Token Parsers.
+     *
+     * @return Twig_TokenParserInterface[] An array of Twig_TokenParserInterface instances
+     */
+    public function getTokenParsers()
+    {
+        if (null === $this->parsers) {
+            $this->parsers = new Twig_TokenParserBroker;
+            foreach ($this->getExtensions() as $extension) {
+                $parsers = $extension->getTokenParsers();
+                foreach($parsers as $parser) {
+                    if ($parser instanceof Twig_TokenParserInterface) {
+                        $this->parsers->addTokenParser($parser);
+                    } else if ($parser instanceof Twig_TokenParserBrokerInterface) {
+                        $this->parsers->addTokenParserBroker($parser);
+                    } else {
+                        throw new Twig_Error_Runtime('getTokenParsers() must return an array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances');
+                    }
+                }
+            }
+        }
+
+        return $this->parsers;
+    }
+
+    /**
+     * Registers a Node Visitor.
+     *
+     * @param Twig_NodeVisitorInterface $visitor A Twig_NodeVisitorInterface instance
+     */
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        if (null === $this->visitors) {
+            $this->getNodeVisitors();
+        }
+
+        $this->visitors[] = $visitor;
+    }
+
+    /**
+     * Gets the registered Node Visitors.
+     *
+     * @return Twig_NodeVisitorInterface[] An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        if (null === $this->visitors) {
+            $this->visitors = array();
+            foreach ($this->getExtensions() as $extension) {
+                $this->visitors = array_merge($this->visitors, $extension->getNodeVisitors());
+            }
+        }
+
+        return $this->visitors;
+    }
+
+    /**
+     * Registers a Filter.
+     *
+     * @param string               $name    The filter name
+     * @param Twig_FilterInterface $visitor A Twig_FilterInterface instance
+     */
+    public function addFilter($name, Twig_FilterInterface $filter)
+    {
+        if (null === $this->filters) {
+            $this->loadFilters();
+        }
+
+        $this->filters[$name] = $filter;
+    }
+
+    /**
+     * Get a filter by name.
+     *
+     * Subclasses may override this method and load filters differently;
+     * so no list of filters is available.
+     *
+     * @param string $name The filter name
+     *
+     * @return Twig_Filter|false A Twig_Filter instance or false if the filter does not exists
+     */
+    public function getFilter($name)
+    {
+        if (null === $this->filters) {
+            $this->loadFilters();
+        }
+
+        if (isset($this->filters[$name])) {
+            return $this->filters[$name];
+        }
+
+        foreach ($this->filterCallbacks as $callback) {
+            if (false !== $filter = call_user_func($callback, $name)) {
+                return $filter;
+            }
+        }
+
+        return false;
+    }
+
+    public function registerUndefinedFilterCallback($callable)
+    {
+        $this->filterCallbacks[] = $callable;
+    }
+
+    /**
+     * Gets the registered Filters.
+     *
+     * @return Twig_FilterInterface[] An array of Twig_FilterInterface instances
+     */
+    protected function loadFilters()
+    {
+        $this->filters = array();
+        foreach ($this->getExtensions() as $extension) {
+            $this->filters = array_merge($this->filters, $extension->getFilters());
+        }
+    }
+
+    /**
+     * Registers a Test.
+     *
+     * @param string             $name    The test name
+     * @param Twig_TestInterface $visitor A Twig_TestInterface instance
+     */
+    public function addTest($name, Twig_TestInterface $test)
+    {
+        if (null === $this->tests) {
+            $this->getTests();
+        }
+
+        $this->tests[$name] = $test;
+    }
+
+    /**
+     * Gets the registered Tests.
+     *
+     * @return Twig_TestInterface[] An array of Twig_TestInterface instances
+     */
+    public function getTests()
+    {
+        if (null === $this->tests) {
+            $this->tests = array();
+            foreach ($this->getExtensions() as $extension) {
+                $this->tests = array_merge($this->tests, $extension->getTests());
+            }
+        }
+
+        return $this->tests;
+    }
+
+    /**
+     * Registers a Function.
+     *
+     * @param string                 $name     The function name
+     * @param Twig_FunctionInterface $function A Twig_FunctionInterface instance
+     */
+    public function addFunction($name, Twig_FunctionInterface $function)
+    {
+        if (null === $this->functions) {
+            $this->loadFunctions();
+        }
+
+        $this->functions[$name] = $function;
+    }
+
+    /**
+     * Get a function by name.
+     *
+     * Subclasses may override this method and load functions differently;
+     * so no list of functions is available.
+     *
+     * @param string $name function name
+     *
+     * @return Twig_Function|false A Twig_Function instance or false if the function does not exists
+     */
+    public function getFunction($name)
+    {
+        if (null === $this->functions) {
+            $this->loadFunctions();
+        }
+
+        if (isset($this->functions[$name])) {
+            return $this->functions[$name];
+        }
+
+        foreach ($this->functionCallbacks as $callback) {
+            if (false !== $function = call_user_func($callback, $name)) {
+                return $function;
+            }
+        }
+
+        return false;
+    }
+
+    public function registerUndefinedFunctionCallback($callable)
+    {
+        $this->functionCallbacks[] = $callable;
+    }
+
+    protected function loadFunctions()
+    {
+        $this->functions = array();
+        foreach ($this->getExtensions() as $extension) {
+            $this->functions = array_merge($this->functions, $extension->getFunctions());
+        }
+    }
+
+    /**
+     * Registers a Global.
+     *
+     * @param string $name  The global name
+     * @param mixed  $value The global value
+     */
+    public function addGlobal($name, $value)
+    {
+        if (null === $this->globals) {
+            $this->getGlobals();
+        }
+
+        $this->globals[$name] = $value;
+    }
+
+    /**
+     * Gets the registered Globals.
+     *
+     * @return array An array of globals
+     */
+    public function getGlobals()
+    {
+        if (null === $this->globals) {
+            $this->globals = array();
+            foreach ($this->getExtensions() as $extension) {
+                $this->globals = array_merge($this->globals, $extension->getGlobals());
+            }
+        }
+
+        return $this->globals;
+    }
+
+    /**
+     * Gets the registered unary Operators.
+     *
+     * @return array An array of unary operators
+     */
+    public function getUnaryOperators()
+    {
+        if (null === $this->unaryOperators) {
+            $this->initOperators();
+        }
+
+        return $this->unaryOperators;
+    }
+
+    /**
+     * Gets the registered binary Operators.
+     *
+     * @return array An array of binary operators
+     */
+    public function getBinaryOperators()
+    {
+        if (null === $this->binaryOperators) {
+            $this->initOperators();
+        }
+
+        return $this->binaryOperators;
+    }
+
+    protected function initOperators()
+    {
+        $this->unaryOperators = array();
+        $this->binaryOperators = array();
+        foreach ($this->getExtensions() as $extension) {
+            $operators = $extension->getOperators();
+
+            if (!$operators) {
+                continue;
+            }
+
+            if (2 !== count($operators)) {
+                throw new InvalidArgumentException(sprintf('"%s::getOperators()" does not return a valid operators array.', get_class($extension)));
+            }
+
+            $this->unaryOperators = array_merge($this->unaryOperators, $operators[0]);
+            $this->binaryOperators = array_merge($this->binaryOperators, $operators[1]);
+        }
+    }
+
+    protected function writeCacheFile($file, $content)
+    {
+        if (!is_dir(dirname($file))) {
+            mkdir(dirname($file), 0777, true);
+        }
+
+        $tmpFile = tempnam(dirname($file), basename($file));
+        if (false !== @file_put_contents($tmpFile, $content)) {
+            // rename does not work on Win32 before 5.2.6
+            if (@rename($tmpFile, $file) || (@copy($tmpFile, $file) && unlink($tmpFile))) {
+                chmod($file, 0644);
+
+                return;
+            }
+        }
+
+        throw new Twig_Error_Runtime(sprintf('Failed to write cache file "%s".', $file));
+    }
+}

lib/Twig/Error.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig base exception.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error extends Exception
+{
+    protected $lineno;
+    protected $filename;
+    protected $rawMessage;
+    protected $previous;
+
+    /**
+     * Constructor.
+     *
+     * @param string    $message  The error message
+     * @param integer   $lineno   The template line where the error occurred
+     * @param string    $filename The template file name where the error occurred
+     * @param Exception $previous The previous exception
+     */
+    public function __construct($message, $lineno = -1, $filename = null, Exception $previous = null)
+    {
+        if (-1 === $lineno || null === $filename) {
+            list($lineno, $filename) = $this->findTemplateInfo(null !== $previous ? $previous : $this, $lineno, $filename);
+        }
+
+        $this->lineno = $lineno;
+        $this->filename = $filename;
+        $this->rawMessage = $message;
+
+        $this->updateRepr();
+
+        if (version_compare(PHP_VERSION, '5.3.0', '<')) {
+            $this->previous = $previous;
+            parent::__construct($this->message);
+        } else {
+            parent::__construct($this->message, 0, $previous);
+        }
+    }
+
+    /**
+     * Gets the raw message.
+     *
+     * @return string The raw message
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+
+    /**
+     * Gets the filename where the error occurred.
+     *
+     * @return string The filename
+     */
+    public function getTemplateFile()
+    {
+        return $this->filename;
+    }
+
+    /**
+     * Sets the filename where the error occurred.
+     *
+     * @param string $filename The filename
+     */
+    public function setTemplateFile($filename)
+    {
+        $this->filename = $filename;
+
+        $this->updateRepr();
+    }
+
+    /**
+     * Gets the template line where the error occurred.
+     *
+     * @return integer The template line
+     */
+    public function getTemplateLine()
+    {
+        return $this->lineno;
+    }
+
+    /**
+     * Sets the template line where the error occurred.
+     *
+     * @param integer $lineno The template line
+     */
+    public function setTemplateLine($lineno)
+    {
+        $this->lineno = $lineno;
+
+        $this->updateRepr();
+    }
+
+    /**
+     * For PHP < 5.3.0, provides access to the getPrevious() method.
+     *
+     * @param  string $method    The method name
+     * @param  array  $arguments The parameters to be passed to the method
+     *
+     * @return Exception The previous exception or null
+     */
+    public function __call($method, $arguments)
+    {
+        if ('getprevious' == strtolower($method)) {
+            return $this->previous;
+        }
+
+        throw new BadMethodCallException(sprintf('Method "Twig_Error::%s()" does not exist.', $method));
+    }
+
+    protected function updateRepr()
+    {
+        $this->message = $this->rawMessage;
+
+        $dot = false;
+        if ('.' === substr($this->message, -1)) {
+            $this->message = substr($this->message, 0, -1);
+            $dot = true;
+        }
+
+        if (null !== $this->filename) {
+            $this->message .= sprintf(' in %s', json_encode($this->filename));
+        }
+
+        if ($this->lineno >= 0) {
+            $this->message .= sprintf(' at line %d', $this->lineno);
+        }
+
+        if ($dot) {
+            $this->message .= '.';
+        }
+    }
+
+    protected function findTemplateInfo(Exception $e, $currentLine, $currentFile)
+    {
+        if (!function_exists('token_get_all')) {
+            return array($currentLine, $currentFile);
+        }
+
+        $traces = $e->getTrace();
+        foreach ($traces as $i => $trace) {
+            if (!isset($trace['class']) || 'Twig_Template' === $trace['class']) {
+                continue;
+            }
+
+            $r = new ReflectionClass($trace['class']);
+            if (!$r->implementsInterface('Twig_TemplateInterface')) {
+                continue;
+            }
+
+            if (!file_exists($r->getFilename())) {
+                // probably an eval()'d code
+                return array($currentLine, $currentFile);
+            }
+
+            if (0 === $i) {
+                $line = $e->getLine();
+            } else {
+                $line = isset($traces[$i - 1]['line']) ? $traces[$i - 1]['line'] : -log(0);
+            }
+
+            $tokens = token_get_all(file_get_contents($r->getFilename()));
+            $templateline = -1;
+            $template = null;
+            while ($token = array_shift($tokens)) {
+                if (isset($token[2]) && $token[2] >= $line) {
+                    return array($templateline, $template);
+                }
+
+                if (T_COMMENT === $token[0] && null === $template && preg_match('#/\* +(.+) +\*/#', $token[1], $match)) {
+                    $template = $match[1];
+                } elseif (T_COMMENT === $token[0] && preg_match('#^//\s*line (\d+)\s*$#', $token[1], $match)) {
+                    $templateline = $match[1];
+                }
+            }
+
+            return array($currentLine, $template);
+        }
+
+        return array($currentLine, $currentFile);
+    }
+}

lib/Twig/Error/Loader.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when an error occurs during template loading.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Loader extends Twig_Error
+{
+}

lib/Twig/Error/Runtime.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when an error occurs at runtime.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Runtime extends Twig_Error
+{
+}

lib/Twig/Error/Syntax.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when a syntax error occurs during lexing or parsing of a template.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Syntax extends Twig_Error
+{
+}

lib/Twig/ExpressionParser.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Parses expressions.
+ *
+ * This parser implements a "Precedence climbing" algorithm.
+ *
+ * @see http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
+ * @see http://en.wikipedia.org/wiki/Operator-precedence_parser
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_ExpressionParser
+{
+    const OPERATOR_LEFT = 1;
+    const OPERATOR_RIGHT = 2;
+
+    protected $parser;
+    protected $unaryOperators;
+    protected $binaryOperators;
+
+    public function __construct(Twig_Parser $parser, array $unaryOperators, array $binaryOperators)
+    {
+        $this->parser = $parser;
+        $this->unaryOperators = $unaryOperators;
+        $this->binaryOperators = $binaryOperators;
+    }
+
+    public function parseExpression($precedence = 0)
+    {
+        $expr = $this->getPrimary();
+        $token = $this->parser->getCurrentToken();
+        while ($this->isBinary($token) && $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
+            $op = $this->binaryOperators[$token->getValue()];
+            $this->parser->getStream()->next();
+
+            if (isset($op['callable'])) {
+                $expr = call_user_func($op['callable'], $this->parser, $expr);
+            } else {
+                $expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
+                $class = $op['class'];
+                $expr = new $class($expr, $expr1, $token->getLine());
+            }
+
+            $token = $this->parser->getCurrentToken();
+        }
+
+        if (0 === $precedence) {
+            return $this->parseConditionalExpression($expr);
+        }
+
+        return $expr;
+    }
+
+    protected function getPrimary()
+    {
+        $token = $this->parser->getCurrentToken();
+
+        if ($this->isUnary($token)) {
+            $operator = $this->unaryOperators[$token->getValue()];
+            $this->parser->getStream()->next();
+            $expr = $this->parseExpression($operator['precedence']);
+            $class = $operator['class'];
+
+            return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
+        } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+            $this->parser->getStream()->next();
+            $expr = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');
+
+            return $this->parsePostfixExpression($expr);
+        }
+
+        return $this->parsePrimaryExpression();
+    }
+
+    protected function parseConditionalExpression($expr)
+    {
+        while ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '?')) {
+            $this->parser->getStream()->next();
+            $expr2 = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'The ternary operator must have a default value');
+            $expr3 = $this->parseExpression();
+
+            $expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
+        }
+
+        return $expr;
+    }
+
+    protected function isUnary(Twig_Token $token)
+    {
+        return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
+    }
+
+    protected function isBinary(Twig_Token $token)
+    {
+        return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
+    }
+
+    public function parsePrimaryExpression()
+    {
+        $token = $this->parser->getCurrentToken();
+        switch ($token->getType()) {
+            case Twig_Token::NAME_TYPE:
+                $this->parser->getStream()->next();
+                switch ($token->getValue()) {
+                    case 'true':
+                    case 'TRUE':
+                        $node = new Twig_Node_Expression_Constant(true, $token->getLine());
+                        break;
+
+                    case 'false':
+                    case 'FALSE':
+                        $node = new Twig_Node_Expression_Constant(false, $token->getLine());
+                        break;
+
+                    case 'none':
+                    case 'NONE':
+                    case 'null':
+                    case 'NULL':
+                        $node = new Twig_Node_Expression_Constant(null, $token->getLine());
+                        break;
+
+                    default:
+                        $node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
+                }
+                break;
+
+            case Twig_Token::NUMBER_TYPE:
+            case Twig_Token::STRING_TYPE:
+                $this->parser->getStream()->next();
+                $node = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+                break;
+
+            default:
+                if ($token->test(Twig_Token::PUNCTUATION_TYPE, '[')) {
+                    $node = $this->parseArrayExpression();
+                } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '{')) {
+                    $node = $this->parseHashExpression();
+                } else {
+                    throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($token->getType(), $token->getLine()), $token->getValue()), $token->getLine());
+                }
+        }
+
+        return $this->parsePostfixExpression($node);
+    }
+
+    public function parseArrayExpression()
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '[', 'An array element was expected');
+        $elements = array();
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+            if (!empty($elements)) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'An array element must be followed by a comma');
+
+                // trailing ,?
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+                    break;
+                }
+            }
+
+            $elements[] = $this->parseExpression();
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']', 'An opened array is not properly closed');
+
+        return new Twig_Node_Expression_Array($elements, $stream->getCurrent()->getLine());
+    }
+
+    public function parseHashExpression()
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '{', 'A hash element was expected');
+        $elements = array();
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
+            if (!empty($elements)) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'A hash value must be followed by a comma');
+
+                // trailing ,?
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
+                    break;
+                }
+            }
+
+            if (!$stream->test(Twig_Token::STRING_TYPE) && !$stream->test(Twig_Token::NUMBER_TYPE)) {
+                $current = $stream->getCurrent();
+                throw new Twig_Error_Syntax(sprintf('A hash key must be a quoted string or a number (unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($current->getType(), $current->getLine()), $current->getValue()), $current->getLine());
+            }
+
+            $key = $stream->next()->getValue();
+            $stream->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'A hash key must be followed by a colon (:)');
+            $elements[$key] = $this->parseExpression();
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '}', 'An opened hash is not properly closed');
+
+        return new Twig_Node_Expression_Array($elements, $stream->getCurrent()->getLine());
+    }
+
+    public function parsePostfixExpression($node)
+    {
+        $firstPass = true;
+        while (true) {
+            $token = $this->parser->getCurrentToken();
+            if ($token->getType() == Twig_Token::PUNCTUATION_TYPE) {
+                if ('.' == $token->getValue() || '[' == $token->getValue()) {
+                    $node = $this->parseSubscriptExpression($node);
+                } elseif ('|' == $token->getValue()) {
+                    $node = $this->parseFilterExpression($node);
+                } elseif ($firstPass && $node instanceof Twig_Node_Expression_Name && '(' == $token->getValue()) {
+                    $node = $this->getFunctionNode($node);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+
+            $firstPass = false;
+        }
+
+        return $node;
+    }
+
+    public function getFunctionNode(Twig_Node_Expression_Name $node)
+    {
+        $args = $this->parseArguments();
+
+        if ('parent' === $node->getAttribute('name')) {
+            if (!count($this->parser->getBlockStack())) {
+                throw new Twig_Error_Syntax('Calling "parent" outside a block is forbidden', $node->getLine());
+            }
+
+            if (!$this->parser->getParent()) {
+                throw new Twig_Error_Syntax('Calling "parent" on a template that does not extend another one is forbidden', $node->getLine());
+            }
+
+            return new Twig_Node_Expression_Parent($this->parser->peekBlockStack(), $node->getLine());
+        }
+
+        if ('block' === $node->getAttribute('name')) {
+            return new Twig_Node_Expression_BlockReference($args->getNode(0), false, $node->getLine());
+        }
+
+        if (null !== $alias = $this->parser->getImportedFunction($node->getAttribute('name'))) {
+            return new Twig_Node_Expression_GetAttr($alias['node'], new Twig_Node_Expression_Constant($alias['name'], $node->getLine()), $args, Twig_TemplateInterface::METHOD_CALL, $node->getLine());
+        }
+
+        return new Twig_Node_Expression_Function($node, $args, $node->getLine());
+    }
+
+    public function parseSubscriptExpression($node)
+    {
+        $token = $this->parser->getStream()->next();
+        $lineno = $token->getLine();
+        $arguments = new Twig_Node();
+        $type = Twig_TemplateInterface::ANY_CALL;
+        if ($token->getValue() == '.') {
+            $token = $this->parser->getStream()->next();
+            if (
+                $token->getType() == Twig_Token::NAME_TYPE
+                ||
+                $token->getType() == Twig_Token::NUMBER_TYPE
+                ||
+                ($token->getType() == Twig_Token::OPERATOR_TYPE && preg_match(Twig_Lexer::REGEX_NAME, $token->getValue()))
+            ) {
+                $arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
+
+                if ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                    $type = Twig_TemplateInterface::METHOD_CALL;
+                    $arguments = $this->parseArguments();
+                } else {
+                    $arguments = new Twig_Node();
+                }
+            } else {
+                throw new Twig_Error_Syntax('Expected name or number', $lineno);
+            }
+        } else {
+            $type = Twig_TemplateInterface::ARRAY_CALL;
+
+            $arg = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ']');
+        }
+
+        return new Twig_Node_Expression_GetAttr($node, $arg, $arguments, $type, $lineno);
+    }
+
+    public function parseFilterExpression($node)
+    {
+        $this->parser->getStream()->next();
+
+        return $this->parseFilterExpressionRaw($node);
+    }
+
+    public function parseFilterExpressionRaw($node, $tag = null)
+    {
+        while (true) {
+            $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE);
+
+            $name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                $arguments = new Twig_Node();
+            } else {
+                $arguments = $this->parseArguments();
+            }
+
+            $node = new Twig_Node_Expression_Filter($node, $name, $arguments, $token->getLine(), $tag);
+
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '|')) {
+                break;
+            }
+
+            $this->parser->getStream()->next();
+        }
+
+        return $node;
+    }
+
+    public function parseArguments()
+    {
+        $args = array();
+        $stream = $this->parser->getStream();
+
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '(', 'A list of arguments must be opened by a parenthesis');
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ')')) {
+            if (!empty($args)) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'Arguments must be separated by a comma');
+            }
+            $args[] = $this->parseExpression();
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'A list of arguments must be closed by a parenthesis');
+
+        return new Twig_Node($args);
+    }
+
+    public function parseAssignmentExpression()
+    {
+        $targets = array();
+        while (true) {
+            $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, null, 'Only variables can be assigned to');
+            if (in_array($token->getValue(), array('true', 'false', 'none'))) {
+                throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s"', $token->getValue()), $token->getLine());
+            }
+            $targets[] = new Twig_Node_Expression_AssignName($token->getValue(), $token->getLine());
+
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+            $this->parser->getStream()->next();
+        }
+
+        return new Twig_Node($targets);
+    }
+
+    public function parseMultitargetExpression()
+    {
+        $targets = array();
+        while (true) {
+            $targets[] = $this->parseExpression();
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+            $this->parser->getStream()->next();
+        }
+
+        return new Twig_Node($targets);
+    }
+}

lib/Twig/Extension.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Extension implements Twig_ExtensionInterface
+{
+    /**
+     * Initializes the runtime environment.
+     *
+     * This is where you can load some file that contains filter functions for instance.
+     *
+     * @param Twig_Environment $environment The current Twig_Environment instance
+     */
+    public function initRuntime(Twig_Environment $environment)
+    {
+    }
+
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers()
+    {
+        return array();
+    }
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return array An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of tests to add to the existing list.
+     *
+     * @return array An array of tests
+     */
+    public function getTests()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of functions to add to the existing list.
+     *
+     * @return array An array of functions
+     */
+    public function getFunctions()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of operators to add to the existing list.
+     *
+     * @return array An array of operators
+     */
+    public function getOperators()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of global functions to add to the existing list.
+     *
+     * @return array An array of global functions
+     */
+    public function getGlobals()
+    {
+        return array();
+    }
+}

lib/Twig/Extension/Core.php

+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Core extends Twig_Extension
+{
+    /**
+     * Returns the token parser instance to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParser instances
+     */
+    public function getTokenParsers()
+    {
+        return array(
+            new Twig_TokenParser_For(),
+            new Twig_TokenParser_If(),
+            new Twig_TokenParser_Extends(),
+            new Twig_TokenParser_Include(),
+            new Twig_TokenParser_Block(),
+            new Twig_TokenParser_Use(),
+            new Twig_TokenParser_Filter(),
+            new Twig_TokenParser_Macro(),
+            new Twig_TokenParser_Import(),
+            new Twig_TokenParser_From(),
+            new Twig_TokenParser_Set(),
+            new Twig_TokenParser_Spaceless(),
+        );
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *